utility.cc (9765:da0e0df0ba97) utility.cc (9880:3fda7e22041b)
1/*
2 * Copyright (c) 2007 The Hewlett-Packard Development Company
3 * Copyright (c) 2011 Advanced Micro Devices, Inc.
4 * All rights reserved.
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating

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263 tc->setIntReg(X86ISA::INTREG_PSEUDO(3), 0);
264 tc->setIntReg(X86ISA::INTREG_PSEUDO(4), 0);
265
266 // Update the RFLAGS misc reg with whatever didn't go into the
267 // magic registers.
268 tc->setMiscReg(MISCREG_RFLAGS, val & ~(ccFlagMask | cfofMask | DFBit));
269}
270
1/*
2 * Copyright (c) 2007 The Hewlett-Packard Development Company
3 * Copyright (c) 2011 Advanced Micro Devices, Inc.
4 * All rights reserved.
5 *
6 * The license below extends only to copyright in the software and shall
7 * not be construed as granting a license to any other intellectual
8 * property including but not limited to intellectual property relating

--- 254 unchanged lines hidden (view full) ---

263 tc->setIntReg(X86ISA::INTREG_PSEUDO(3), 0);
264 tc->setIntReg(X86ISA::INTREG_PSEUDO(4), 0);
265
266 // Update the RFLAGS misc reg with whatever didn't go into the
267 // magic registers.
268 tc->setMiscReg(MISCREG_RFLAGS, val & ~(ccFlagMask | cfofMask | DFBit));
269}
270
271uint8_t
272convX87TagsToXTags(uint16_t ftw)
273{
274 uint8_t ftwx(0);
275 for (int i = 0; i < 8; ++i) {
276 // Extract the tag for the current element on the FP stack
277 const unsigned tag((ftw >> (2 * i)) & 0x3);
278
279 /*
280 * Check the type of the current FP element. Valid values are:
281 * 0 == Valid
282 * 1 == Zero
283 * 2 == Special (Nan, unsupported, infinity, denormal)
284 * 3 == Empty
285 */
286 // The xsave version of the tag word only keeps track of
287 // whether the element is empty or not. Set the corresponding
288 // bit in the ftwx if it's not empty,
289 if (tag != 0x3)
290 ftwx |= 1 << i;
291 }
292
293 return ftwx;
294}
295
271uint16_t
296uint16_t
297convX87XTagsToTags(uint8_t ftwx)
298{
299 uint16_t ftw(0);
300 for (int i = 0; i < 8; ++i) {
301 const unsigned xtag(((ftwx >> i) & 0x1));
302
303 // The xtag for an x87 stack position is 0 for empty stack positions.
304 if (!xtag) {
305 // Set the tag word to 3 (empty) for the current element.
306 ftw |= 0x3 << (2 * i);
307 } else {
308 // TODO: We currently assume that non-empty elements are
309 // valid (0x0), but we should ideally reconstruct the full
310 // state (valid/zero/special).
311 }
312 }
313
314 return ftw;
315}
316
317uint16_t
272genX87Tags(uint16_t ftw, uint8_t top, int8_t spm)
273{
274 const uint8_t new_top((top + spm + 8) % 8);
275
276 if (spm > 0) {
277 // Removing elements from the stack. Flag the elements as empty.
278 for (int i = top; i != new_top; i = (i + 1 + 8) % 8)
279 ftw |= 0x3 << (2 * i);

--- 12 unchanged lines hidden --- 		318genX87Tags(uint16_t ftw, uint8_t top, int8_t spm)
319{
320 const uint8_t new_top((top + spm + 8) % 8);
321
322 if (spm > 0) {
323 // Removing elements from the stack. Flag the elements as empty.
324 for (int i = top; i != new_top; i = (i + 1 + 8) % 8)
325 ftw |= 0x3 << (2 * i);

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